Short sleeps are a type of sleep that is shorter than the average amount of sleep. NAPS, SNOOZES, and CATNAPS are all types of short sleeps. NAPS are typically taken during the day and last for a few minutes to a few hours. SNOOZES are usually taken in the morning and last for a few minutes. CATNAPS are also taken during the day and last for a few minutes. All three types of short sleeps can help people feel more alert and energized.